The entire 1.9 exhaust will bolt onto the 2.1 engine just fine.
There will be no room to keep the 2.1 oil cooler / heat exchanger though. ..
And, if you are using a 1.9 cooling system you probably don't figure to
be running a 2.1 type oil cooler/heat exchanger anyway.

Though having one is a great upgrade to a 2.1 in a 1.9 cooling system.
Don't forget to use your 1.9 crankshaft pulley on the 2.1 block to match
your   1.9  Digijet Distributor .

I would not run the 1.9 exhaust on a 2.1  myself, at least not long term.
The 2.1 exhaust system is twice as good at least.
If you do want to do that, don't forget to get a 2.1 rear engine cradle
thing ..where the 4 rubber mounts are  - that aluminum piece is what the
far better and twin 2.1 muffler mount brackets bolt to.

run the 2.1 throttle body, plenum, and intake runners too, with your
Digijet system
Upgrade to heated oxygen sensor and even the 2.1 breather heater if you
want to.
Make a just great vanogon waterboxer engine system , nice mix of Digijet
and Digifant parts.

Scott

On 6/10/2012 10:56 AM, Paul wrote:
> I'm about to take the plunge and get a 2.1L engine and I've asked before
> and was told that everything from my badly worn 1.9L, the little engine
> that could did manage to get me home with I imagine little to spare, does
> this include the exhaust system too? I can remember when I first got my
> Vanagon I had to replace one of the crossover pipes and the place I got the
> part from got a replacement for a 2.1L and there was no way that was going
> to go on to my existing 1.9L setup.
> TIA,
> Pablo in Tracy
> 85 WWW with a soon to be 2.1L power plant
>